Xws li hom helicaliav sab hauv feem ntau xav tau kev hloov kho profile thiab qhov tseeb yog ISO6-7, ua ntej txhua qhov kev xa khoom, peb yuav muab cov ntawv qhia no rau cov neeg siv khoom kom xyuas cov ntsiab lus ntawm lub nplhaib helical kom paub tseeb tias txhua yam nkag siab meej thiab zoo rau kev xa khoom.
1) Kos duab npuas
2)Ddaim ntawv qhia txog kev xav
3)Hdaim ntawv qhia txog kev noj khoom qab zib ua ntej kho cua sov
4)Hdaim ntawv qhia txog kev noj khoom qab zib tom qab kho cua sov
5)Mdaim ntawv qhia txog sab hauv
6)Adaim ntawv qhia txog qhov tseeb
7)Pcov duab thiab txhua cov yeeb yaj kiab kuaj xws li runout, Cylindricity thiab lwm yam
8) Lwm cov ntawv qhia txog kev sim rau ib tus neeg siv khoom xav tau xws li daim ntawv qhia txog qhov tsis zoo